Breaking a quantum key distribution system through a timing side channel

Details Breaking a quantum key distribution system through a timing side channel Breaking a quantum key distribution system through a timing side channel

2007-04-25

arxiv.org/abs/0704.3297v2

Opt. Express 15, 9388 (2007)

Physics

Quantum Physics

6 pages, 4 figures. Added additional references and extended analysis. Identical to published version

Scientific paper

10.1364/OE.15.009388

The security of quantum key distribution relies on the validity of quantum mechanics as a description of nature and on the non-existence of leaky degrees of freedom in the practical implementations. We experimentally demonstrate how, in some implementations, timing information revealed during public discussion between the communicating parties can be used by an eavesdropper to undetectably access a significant portion of the ``secret'' key.

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